Abstract: The invention discloses a phosphor wheel, and a projector using the phosphor wheel. The projector includes an illumination system, a light valve, and a projection lens. The illumination system is used to provide an illumination beam. The light valve is disposed on a transmission path of the illumination beam and converts the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam. The illumination system includes an excitation light source and a phosphor wheel. The excitation light source is used to provide an excitation beam to the phosphor wheel. The phosphor wheel includes a motor, a disk plate, a reflection member, and at least one phosphor layer. The motor has a shaft. The disk plate is connected to the shaft. In the invention, the phosphor wheel has better reliability and rigidity, and has the effect of enhancing heat dissipation.

Abstract: A projection device for forming an image frame on a projection screen includes a first illumination system for emitting an illumination beam, a second illumination system for emitting an ultraviolet beam, a first light valve located on a transmission path of the illumination beam and for converting the illumination beam into a visible image beam, a lens located on a transmission path of the visible image beam and the ultraviolet beam and for projecting the visible image beam onto the projection screen to form an image frame area and projecting the ultraviolet beam onto the projection screen to form an opaque area, and a processor electrically connected to the first illumination system and the second illumination system and for controlling the first illumination system to emit the illumination beam and controlling the second illumination system to emit the ultraviolet beam. The image frame area partially overlaps the opaque area.

Abstract: A projection screen for receiving a visible image beam and an ultraviolet beam from a projection device is provided. The projection screen includes a substrate, an anti-reflection layer and an anti-ultraviolet layer. The substrate includes a first surface adjacent to the projection device, a second surface away from the projection device and opposite to the first surface, a scattering reflection layer disposed between the first surface and the second surface, and an ultraviolet absorption layer disposed between the first surface and the second surface. The scattering reflection layer scatters and reflects the visible image beam. The ultraviolet absorption layer absorbs the ultraviolet beam so as to be changed from a transparent state to an opaque state. The anti-reflection layer is disposed on the first surface. The anti-ultraviolet layer is disposed at the second surface. The ultraviolet absorption layer is located between the scattering reflection layer and the anti-ultraviolet layer.

Abstract: A head mounted display device includes at least one display panel, two first lenses, two second lenses, and microstructures. The display panel is adapted to provide an image beam. The first lenses are disposed between the display panel and a focus area. Each first lens includes a first surface and a second surface. The second lenses are disposed between the first lenses and the focus area. The microstructures are disposed on at least one of the first surfaces and the second surfaces. Each first lens has an axis. The microstructures include a first microstructure group disposed close to the axis and a second microstructure group disposed away from the axis. A first angle is formed between any two adjacent microstructures in the first microstructure group, and a second angle is formed between any two adjacent microstructures in the second microstructure group. The first angle is greater than the second angle.

Abstract: A projector includes an illumination system, a light valve, and a lens. The illumination system includes a scanning light source assembly and a wavelength conversion device. The scanning light source assembly provides an excitation beam. The excitation beam scans in a plurality of scanning directions. The wavelength conversion device is disposed on a transmission path of the excitation beam. The excitation beam scans the wavelength conversion device in the scanning directions in a plurality of time intervals respectively, and the excitation beam is converted into a color beam by the wavelength conversion device in one of the time intervals. The light valve is disposed on a transmission path of an illumination beam and converts the illumination beam into an image beam, wherein the illumination beam includes the color beam. The lens is disposed on a transmission path of the image beam.

Abstract: An illumination system includes at least one excitation light source, a holographic optical element and a phosphor wheel. The excitation light source provides a first color beam. The holographic optical element is located on a path of the first color beam and transmits the first color beam to the phosphor wheel along a first path. The phosphor wheel has a light wavelength conversion portion and a reflective portion. The light wavelength conversion portion converts the first color beam into a second color beam and reflects the second color beam back to the holographic optical element. The reflective portion reflects the first color beam back to the holographic optical element. The holographic optical element transmits the second color beam and the first color beam reflected from the phosphor wheel along a second path, and the first path is different from the second path. A projection apparatus is also provided.

Abstract: A head-mounted display including a transparent display, a first liquid crystal lens and a second liquid crystal lens is provided. The transparent display is adapted to emit an image light beam. The first liquid crystal lens is disposed beside the transparent display. The transparent display is disposed between the first liquid crystal lens and the second liquid crystal lens. The second liquid crystal lens is adapted to receive an ambient light beam. The image light beam passes through the first liquid crystal lens by the phase changing of the first liquid crystal lens, and then the image light beam passes through a pupil.

Abstract: A head-mounted display device including a display and a beam combiner is provided. The display is configured to emit an image bean, and the beam combiner includes a plurality of stacked light-splitting layers. The light-splitting layers include a first light-splitting layer and a second light-splitting layer. The image beam is adapted to enter and exit the beam combiner through the first light-splitting layer. The first light-splitting layer is located between the second light-splitting layer and the display. The beam combiner satisfies 0.7?R1/(T1×R2×T1)?1.3. Here, R1 is light reflectivity of the first light-splitting layer, T1 is light transmittance of the first light-splitting layer, and R2 is light reflectivity of the second light-splitting layer. The head-mounted display device provided herein has advantages of usage convenience and compactness.

Abstract: An optical waveguide element including a light entrance portion and a light exit portion is provided. The light entrance portion includes a first light guide layer, a second light guide layer, and at least one third light guide layer. Light entrance surfaces of the first light guide layer and the second light guide layer jointly compose a first inclined surface. Light exit surfaces of the first light guide layer and the second light guide layer jointly compose a second inclined surface. The first inclined surface and the second inclined surface are inclined relative to a bottom surface of the first light guide layer. The thickness of the light exit portion is less than the total thickness of the first light guide layer, the second light guide layer, and the at least one third light guide layer. A display device is also provided.

Abstract: A light guide element of a wearable apparatus adapted to guide a light beam includes first and second light guide plates and a light splitting film. The first light guide plate has first and second surfaces, and a light entrance surface. The second light guide plate is disposed on the partial first surface and located on a transmission path of the light beam. The light splitting film is disposed between the partial first surface and the second light guide plate, and adjacent to the light entrance surface. The light splitting film is adapted to reflect a portion of the light beam and allow the partial light beam from the partial first surface to pass to the second light guide plate.

Abstract: A head-mounted display including an apparatus body including a first part and a second part connected to the first part and an image display device disposed in the apparatus body is provided. The image display device projects an image to a projection target and includes an image output element, a plurality of lens elements, a light diffuser, and an imaging element. The imaging element projects the image beam to the projection target to display the image. The lens elements include a first lens element and a second lens element. The image output element generates an intermediate image on a transmitting path of the image beam between the first and second lens elements. The light diffuser is disposed on the transmitting path of the image beam and in a predetermined interval where the intermediate image is located at the center.

Abstract: A head-mounted display including an apparatus body and an image display device is provided. The apparatus body includes a first part and a second part connected to the first part. The image display device is disposed at the apparatus body and adapted to project a display image to a projection target. The image display device includes a fiber element and an imaging element. The fiber element is adapted to transmit an illumination beam. The imaging element is adapted to project the image beam to the projection target to display the display image. The fiber element is disposed at the first part of the apparatus body. The imaging element is disposed at one of the first part and the second part of the apparatus body. The head-mounted display is capable of expanding the user's field of view and reducing the size and weight.

Abstract: A head-mounted display including an apparatus body and an image display device is provided. The apparatus body includes a first part and a second part assembled to the first part. The image display device is disposed in the apparatus body, projects an image to a projection target, and includes an image output element, a plurality of lens elements, and an imaging element. The image output element outputs an image beam transmitted to the imaging element through the lens elements. The imaging element projects the image beam to the projection target to display the image. The image output element and the lens elements are disposed in the first part. The projection target is located on a reference plane, on which a projection of the image output element is above the projection target.

Abstract: A head-mounted display apparatus projected an image onto a projection target is provided. The head-mounted display apparatus includes an image output module, an image control module, an optical fiber, and an optical adjusting device. The image output module projects the image onto the projection target. The image control module outputs a lighting beam and an electrical signal to the image output module, so as to control the image output module to project the image onto the projection target by using the electrical signal. The optical fiber is coupled to the image output module and the image control module. The lighting beam is transmitted from the image control module to the image output module via the optical fiber. The optical adjusting device is disposed at the output terminal of the optical fiber and transmits the lighting beam to the image output module.

Abstract: A head-mounted display including a transparent display, a first liquid crystal lens and a second liquid crystal lens is provided. The transparent display is adapted to emit an image light beam. The first liquid crystal lens is disposed beside the transparent display. The transparent display is disposed between the first liquid crystal lens and the second liquid crystal lens. The second liquid crystal lens is adapted to receive an ambient light beam. The image light beam passes through the first liquid crystal lens by the phase changing of the first liquid crystal lens, and then the image light beam passes through a pupil.

Abstract: A head-mounted display including a transparent display, a liquid crystal lens and a first Fresnel lens is provided. The transparent display is configured to emit an image light beam. The liquid crystal lens is disposed near the transparent display. The transparent display is disposed between the liquid crystal lens and the first Fresnel lens. The first Fresnel lens is configured to receive an ambient light beam. The head-mounted display allows at least a part of the image light beam emitted from the transparent display passing through a pupil by phase modulating of at least a part of the liquid crystal lens.

Abstract: A head-mounted display apparatus including a main body, a mask, and a projection apparatus is provided. The mask is pivotally connected to the main body. The mask includes a reflection area. The reflection area has a first normal line. The projection apparatus is disposed inside the main body and adapted to project an image beam to a target. The projection apparatus includes a mirror. The mirror has a second normal line. An acute angle exists between normal projections of the first normal line and the second normal line on a reference plane.

Abstract: An optical module includes an optical waveguide, at least one beam splitter and a light source. The optical waveguide has a first surface, a second surface and a light incidence surface. An interior angle between the light incidence surface and the first surface is ?. A distance between the first and the second surfaces is T. A refractive index of the optical waveguide is n. Each beam splitter and the first surface have a first intersection point on a reference plane perpendicular to the first surface, and the light incidence surface and the second surface have a second intersection point having a first orthogonal projection on the first surface. A distance between the first orthogonal projection and the first intersection point closest to the light incidence surface is H. An incidence angle of a beam at the light incidence surface is a, and a ? sin - 1 ? { n × sin - 1 ? [ 90 ? ° - ? - tan - 1 ? ( H T ) ] } .

Abstract: A head mounted display device includes at least one display panel, two first lenses, two second lenses, and microstructures. The display panel is adapted to provide an image beam. The first lenses are disposed between the display panel and a focus area. Each first lens includes a first surface and a second surface. The second lenses are disposed between the first lenses and the focus area. The microstructures are disposed on at least one of the first surfaces and the second surfaces. Each first lens has an axis. The microstructures include a first microstructure group disposed close to the axis and a second microstructure group disposed away from the axis. A first angle is formed between any two adjacent microstructures in the first microstructure group, and a second angle is formed between any two adjacent microstructures in the second microstructure group. The first angle is greater than the second angle.

Abstract: An optical module includes an optical waveguide, at least one beam splitter and a light source. The optical waveguide has a first surface, a second surface and a light incidence surface. An interior angle between the light incidence surface and the first surface is ?. A distance between the first and the second surfaces is T. A refractive index of the optical waveguide is n. Each beam splitter and the first surface have a first intersection point on a reference plane perpendicular to the first surface, and the light incidence surface and the second surface have a second intersection point having a first orthogonal projection on the first surface. A distance between the first orthogonal projection and the first intersection point closest to the light incidence surface is H. An incidence angle of a beam at the light incidence surface is a, and a ? sin - 1 ? { n × sin - 1 ? [ 90 ? ° - ? - tan - 1 ? ( H T ) ] } .